Positive stop abrading tool



K. W. CONNOR POSITIVE STOP ABRADING TOOL 7 Jan. 30, 1940.

Filed March 12, 1937 H FQI i x w W//// v INVENTOR Patented Jan. 30, 19 40 z sssm POSITIVE- STOP ABRAD'INGXTT'OOL :Kirke W. Connor, Detroit, Mich.,.-;assignor=.to

Micromatic Hone Corporation," Detroit, Mich;

. a corporation of Michigan ApplicationMarch 12, 1937;."-Serial No. 130.560

2 Claims. o1. 51- 1843) My invention relates :tohoning tools and par- 'ti'cularly to a. honingctool of the production type 1 embodying a stop for positively limiting the dergree of expansion of the abrading elements.

Honing tools of the production type were hereitoforeprovidedwith a spring which was disposed win a :cage:.which. applied an initial deflectionzto :the-springand insured a deflection thereafter "ziwhich..was proportional to the applied load.

Means were provided on thetool for adjustingthe amountiof defiectionso that after the tool was inserted within a cylinder to be machined and the abrading elements expanded into contact with the wall thereof, the spring would provide a feed movement to the abrading elements until it was limited in expansion by the cage. Thereafter the stones were held to a predetermined diameter and the surface of the cylinder wall was honed to a desired finish.

While a positive stop was provided in this manner, certain types of cylinder honing required a more positive stop and this I have provided in the honing tool embodying my present invention.

Accordingly, the main objects of my invention are; to provide a honing tool with a cone and adjustable means engageable with the cone for limiting its movement; to provide a shaft projecting from the end of the cone, which operates in an adjustable sleeve to limit the axial movement of the cone toward abrading element expanding position; to provide a shaft in extension of the cone which is flexible to permit universal movement of the tool parts, and in general, to provide a honing tool with a positive stop which is adjustable, positive in operation and economical of manufacture.

Other objects and features of novelty of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawing, wherein:

Figures 1, 2 and 3 are partial views of a honing tool, with parts in section, having a positive stop which embodies features of my invention.

The honing tool comprises a hollow spindle 5 having an abrading body 6 pivoted thereto by a pair of pins 1 having clearance to permit the slight universal movement of the body 6 relative to the spindle 5. The body 6 is provided with a plurality of slots 8 in which abrading elements 9 are mounted for radial movement. Guide elements ll may be disposed between the abrading elements for guiding the body portion when the abrading elements are retracted and the tool is being inserted'ior withdrawn from a cylinder. abrading element expandingcone I2 is mounted Within'the hollow interior of the body 6 for axial movement.

The sloping surface of the cone engages'the carriersfor the abrading elements5 9 and'control theirradiallposition with reference to the bodyaportion'.

- The cone l2 carries a pin l3 which projects 'through a slot J lin the body'E into apertures in .theend of a sleeve :15 which. encompassestheis: vbodyfianclthe hollow-spindle 5. The upperend of the sleeve 15 engages a spring it which is mounted within a cage l! which provides an initial deflection to the spring and limits its expansion. A sleeve I8 extends over the spring it and engages the cage 11. The upper end of the sleeve l8 is threaded and carries an, adjusting nut 19, a locking ring 2!, a ball bearing 22 and a cam collar 23. By adjusting the nut E9 the amount of deflection produced in the spring l6 through the longitudinal movement of the sleeve l8 and cage I! is controlled. A collar 24, carrying a plurality of cam fingers 25, is mounted above the cam collar 23 over a nutv 26 which is threaded on the hollow spindle 5. The position of the fingers 25 relative to the cam collar 23 is regulated through the adjustment of thenut 26 operating through a ball bearing 21, which adjusted position is maintained by a lock nut 28.

The tool so far described is similar to that illustrated and claimed in the patent to Jeschke, No. 1,944,660, issued April 18, 1929, and assigned to the assignee of the present invention. In the structure of the patent the spindle 5 was solid and the cage ll was depended upon to limit the ex pansion of the abrading elements 9. In the presentconstruction the cone H has a long slender shaft 31 secured to its upper end bysuitable means herein shown as by a threaded engagement secured by a nut 32. The upper end of the shaft 3! is provided with a head 33 operating within a cylinder 34 which limits the downward movement of the shaft through the engagement of the shoulder 35 with the head. The cylinder M is carried on a pin 36 which projects through a slot 38 in the spindle 5 into a collar 31 which is slidable upon the upper end of the spindle. An adjusting nut 39 is threaded on the spindle 5 and cooperates with the collar 31 to position the collar relative to the spindle. A locking pin ll is carried by the nut 39 for engagement with indentations 42 in the collar 31 for retaining the nut in adjusted position. i

A ball locking joint 43 secures the spindle 5 to the universal drive head 44 to provide for the quick release and attachment of the tool. A collar 45 when moved upwardly against the tension of the spring 46 releases the balls and permits the tool to be withdrawn.

In operation, the nut I9 is adjusted to provide a deflection to the spring l6 for expanding the abrading elements 9 a predetermined amount. The fingers 25 are shown out of camming position, with the abrading elements 9 retracted. The nut 39 is adjusted to position the cylinder 34 relative to the head 33 of the shaft 3| to have the shoulder in a position to engage the head when the abrading elements have expanded a desired amount. When the tool is inserted within a cylinder to be machined, the cam fingers 25 engage the inner wall of a sleeve (not shown) which forces them radially inwardly and thereby operates on the cam collar 23 to move the sleeve l8 downwardly to provide a tension to the spring [6, through the movement of the cage IT. The bias of the spring acting through the sleeve [5 and pin l3 moves the cone I2 downwardly to expand the abrading elements into engagement with the cylinder wall. The expansion will continue until the cage 11 engages both ends of the spring I 6 or until the head 33 of the shaft 3| engages the shoulder 35 of the cylinder 34. Suflicient deflec- 2 tion is provided to the spring I 6 to have the head 33 engage the shoulder 35 and to thereby depend upon such engagement for limiting downward movement of the cone I2. The position of such engagement may be accurately adjusted to thereby positively and accurately control the degree of radial expansion of the abrading elements 9.

While I have described and illustrated but a single embodiment of my invention, it will be apparent to those skilled in the art that various changes, omissions, additions and substitutions may be made therein without departing from the spirit and scope of my invention, as set forth in the accompanying claims.

What I claim is:

1. An abrading tool provided with a plurality of radially movable abrading elements, a hollow spindle supporting said elements, a cone for effecting expansion of said elements, means for operating said cone, a headed shaft independent of said operating means carried by said cone, a shoulder cylinder within which the head of said shaft is movable, and means for adjusting said cylinder relative to said hollow spindle.

2. A honing tool having a plurality of radially movable abrading elements, means for expanding said elements, a spring for applying a bias to said expanding means, means for adjusting the tension on said spring, a headed shaft secured to said expanding means, a cylinder in which the head of said shaft is slidable having a shoulder for engaging said head, and means for adjusting the position of said cylinder.

, KIRKE W. CONNOR. 

